CEDAR RAPIDS, Iowa – On her first full day of campaigning since announcing a run for president, Massachusetts Sen. Elizabeth Warren suggested her 2020 Republican opponent may not be President Donald Trump.

It marked the first time Warren has targeted the president directly while at an event in the early caucus state. During a multi-day tour earlier this year, Warren hardly talked about Trump at all – and she even avoided mentioning his name.

Despite taking an early direct jab at the president on Sunday, Warren said Trump is the symptom of a bigger problem. She quickly transitioned into talking about her values – something she later told the Des Moines Register will be the focus of her campaign.

Sen. Elizabeth Warren, D-Mass., speaks in the Veterans Memorial Building in downtown Cedar Rapids on Sunday, Feb. 10, 2019, the day after announcing her run for president. (Photo: Kelsey Kremer/The Register)

"As we go forward in this campaign, is it going to be chasing every tweet and nasty statement from Donald Trump, or are we going to talk about what's broken in our country and what are our plans to fix it? I want to talk about what's going wrong and how we set it right," she said in an interview with the Register.

In Cedar Rapids, where the senator opened the event to questions, a woman asked if Warren supports impeaching the president.

Warren, calling it a "fair and reasonable question," said she will let special counsel Robert Mueller finish his investigation into Russian interference in the 2016 election before deciding. On the one hand, she said, the investigation is almost finished, and on the other, a completed investigation will let Congress – and the public – see all available evidence before it's taken to a vote.

"If we go down that path, we're going to need to help pull this country together and have as many people as possible understand that it was a legitimate process based on facts that came from an independent investigation," Warren said. She added that Congress must "absolutely insist" that Mueller's full report be made public.

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U.S. Sen. Elizabeth Warren, D-Mass, speaks to supporters during a campaign stop on Sunday, Feb. 10, 2019 at the Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

Sen. Elizabeth Warren, D-Mass., hugs a woman in the crowd after speaking in the Veterans Memorial Building in downtown Cedar Rapids on Sunday, Feb. 10, 2019. Warren stayed as long as it took to meet and take a photo with every person that wanted one. Kelsey Kremer/The Register

The crowd gathered in the Veterans Memorial Building in downtown Cedar Rapids listens and applauds Sen. Elizabeth Warren, D-Mass, on Sunday, Feb. 10, 2019. About 200 people attended her first campaign stop in Iowa after officially announcing her 2020 campaign. Kelsey Kremer/The Register

U.S. Sen. Elizabeth Warren, D-Mass, speaks to supporters during a campaign stop on Sunday, Feb. 10, 2019 at the Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

Iowa City Councilor Mazahir Salih, right, and Johnson County Supervisor Royceann Porter cheer during an Elizabeth Warren campaign stop on Sunday, Feb. 10, 2019 at the Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

U.S. Sen. Elizabeth Warren, D-Mass, speaks to supporters during a campaign stop on Sunday, Feb. 10, 2019 at the Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

An Iowa flag is seen while U.S. Sen. Elizabeth Warren, D-Mass, speaks to supporters during a campaign stop on Sunday, Feb. 10, 2019 at the Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

U.S. Sen. Elizabeth Warren, D-Mass, speaks to supporters during a campaign stop on Sunday, Feb. 10, 2019 at the Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

The crowd gathered in the Veterans Memorial Building in downtown Cedar Rapids listens and applauds Sen. Elizabeth Warren, D-Mass, on Sunday, Feb. 10, 2019. About 200 people attended her first campaign stop in Iowa after officially announcing her 2020 campaign. Kelsey Kremer/The Register

U.S. Sen. Elizabeth Warren, D-Mass, speaks during a campaign stop on Sunday, Feb. 10, 2019 at Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

A sticker for U.S. Sen. Elizabeth Warren, D-Mass, gets stuck to the carpet during a campaign stop on Sunday, Feb. 10, 2019 at the Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

Two people listen to U.S. Sen. Elizabeth Warren, D-Mass, speak during a campaign stop from the balcony of the ballroom on Sunday, Feb. 10, 2019 at the Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

U.S. Sen. Elizabeth Warren, D-Mass, waves to supporters after speaking during a campaign stop on Sunday, Feb. 10, 2019 at Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

The crowd gathered in the Veterans Memorial Building in downtown Cedar Rapids listens and applauds Sen. Elizabeth Warren, D-Mass, on Sunday, Feb. 10, 2019. About 200 people attended her first campaign stop in Iowa after officially announcing her 2020 campaign. Kelsey Kremer/The Register

A group of people gather before Sen. Elizabeth Warren, D-Mass, speaks at a campaign stop on Sunday, Feb. 10, 2019, in the Veterans Memorial Building in downtown Cedar Rapids. Kelsey Kremer/The Register

U.S. Sen. Elizabeth Warren, D-Mass, speaks during a campaign stop on Sunday, Feb. 10, 2019 at Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

U.S. Sen. Elizabeth Warren, D-Mass, speaks during a campaign stop on Sunday, Feb. 10, 2019 at Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

U.S. Sen. Elizabeth Warren, D-Mass, speaks during a campaign stop on Sunday, Feb. 10, 2019 at Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

Supporters listen to U.S. Sen. Elizabeth Warren, D-Mass, speak during a campaign stop on Sunday, Feb. 10, 2019 at Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

Supporters hold signs for U.S. Sen. Elizabeth Warren, D-Mass, while listening to her speak during a campaign stop on Sunday, Feb. 10, 2019 at Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

U.S. Sen. Elizabeth Warren, D-Mass, walks out from backstage to speak during a campaign stop on Sunday, Feb. 10, 2019 at Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

U.S. Sen. Elizabeth Warren, D-Mass, speaks to reporters during a campaign stop on Sunday, Feb. 10, 2019 at Iowa Memorial Union on the University of Iowa campus in Iowa City, Iowa. Joseph Cress/Iowa City Press-Citizen

The Massachusetts Democrat formally announced her bid on Saturday in Lawrence, Massachusetts, before embarking on a seven-state tour. She scheduled Iowa stops Sunday in Cedar Rapids, Iowa City and Davenport.

"I am delighted to be in Iowa because it's a chance to be face-to-face, person-to-person with deeply engaged people," she told the Register. "Every event that I've done here has been around issues that matter to the whole country. People in Iowa have asked hard, interesting, engaged questions.

"I'm going to be here as often as I can."

As she had before, Warren spoke in Iowa of her upbringing, her fight to make America work not just for the rich and powerful, and her efforts to take corruption out of politics by ending lobbying and requiring tax return disclosures by all candidate for federal office.

In Iowa City, home to the University of Iowa, she opened by proposing debt-free college for all and reducing the burden of student loan debt on existing borrowers.

She spoke of the $50-a-semester college she attended to become a teacher. It was that affordable education that pushed her into the middle class, unlike many young people today whose debt is "crushing their dreams," she said.

"I'm not somebody who picked up this issue because it polled well," she told the Register. "This is what I've been working on for my whole life. It's been about documenting the hollowing out of America's middle class. It's about how people work harder than ever but the path is getting rockier – and even rockier for people of color.